Different counts in MacConkey Agar

Lynn kees.lyn at xtra.co.nz
Sun May 28 04:53:48 EST 2000


david.lawton1 wrote:
> 
> "Yjgent" <yjgent at aol.com> wrote in message
> news:20000526213618.02915.00000277 at ng-fz1.aol.com...
> > >In this lab we're working with E.Coli (ATCC 25922 and wild type) and we
> > >routinely use MacConkey Agar inclusion plating as a counting method for
> > >these microorganisms.
> >
> > I was taught a long time ago NOT to measure a colony count from a Mac
> plate.
> > Only a non selective agar like TSA or a Blood Agar plate can be used to
> count
> > colonies.
> > John Gentile M(ASCP)                   President - Rhode Island Apple
> Group
> > yjgent at aol.com
> > Microbiologists do it with culture.
> Depends on the formulation and what you are trying to count.
> For years we used a MacConkey that surpressed gram - positives combined with
> a blood agar for urine.
> You can use Mac for water counts, though not recommended
> 
> Dave


Why is it not recommended for water counts, what would be more suitable?
Lynn






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